Tywin found out and persuaded Jaime to tell Tyrion that she had been a whore, paid to pretend to love him.
In A Storm of Swords Jaime confesses the truth and an enraged Tyrion confronts his father and kills him. The TV show did it all about Shae’s duplicity, but in the books, the betrayal and hurt runs much deeper and dates back years.
Before dying, Tywin lets it slip that Tysha did not die like Tyrion thought, but that she went “everywhere the bitches go.”
Readers will know that there are major clues pointing to a certain whore with a golden haired girl.